The angular momentum quantum number also affects the energyof an electron, but in general not as much as the principal quantum numberdoes. In the absence of an electric or magnetic field around the atom,only these two quantum numbers have any effect on the energy of theelectron. The values of l are often given letter designations, so that whenthey are stated along with principal quantum numbers, less confusion results.The letter designations of importance in the ground states of atomsare presented in Table 3.2.
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